osama bin laden -- it is close to saudi arabia, there are funding sources from private citizens. >> yemen is on high alert. security has been tightened. multiple checkpoints have been set up and tanks are guarding key installations. the yemeni army has surrounded foreign buildings as well as the airport. the strategic interest to the red sea is also being closely monitored. as muslims celebrate the end of the month of ramen on -- ramadan, the yemeni government says they have foiled a plot by al qaeda. >> the interior ministry has implemented many security plans for safety and stability in yemen. to protect our citizens and the foreigners living here. the united states says it will remain cautious and keep 19 of the 22 diplomatic post closed at least until the end of the week. >> the use of drones is one way the u.s. military has approached unmanned combat. >> they look like something from a science-fiction movie movie, but they are very real. some fear these robots could become the drones of the future. he looks like a soldier, moves like a soldier, and marches like a soldier. underneath